Deprecate Spring Data Solr support

Closes gh-24942

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/solr/SolrRepositoriesAutoConfiguration.java

@@ -40,6 +40,7 @@ import org.springframework.data.solr.repository.support.SolrRepositoryFactoryBea
  *
  * @author Christoph Strobl
  * @author Oliver Gierke
+ * @deprecated since 2.3.9 as Spring Data Solr is deprecated
  * @since 1.1.0
  */
 @Configuration(proxyBeanMethods = false)
@@ -48,6 +49,7 @@ import org.springframework.data.solr.repository.support.SolrRepositoryFactoryBea
 @ConditionalOnProperty(prefix = "spring.data.solr.repositories", name = "enabled", havingValue = "true",
 		matchIfMissing = true)
 @Import(SolrRepositoriesRegistrar.class)
+@Deprecated
 public class SolrRepositoriesAutoConfiguration {
 
 }

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/solr/SolrRepositoriesRegistrar.java

@@ -30,6 +30,7 @@ import org.springframework.data.solr.repository.config.SolrRepositoryConfigExten
  *
  * @author Christoph Strobl
  */
+@Deprecated
 class SolrRepositoriesRegistrar extends AbstractRepositoryConfigurationSourceSupport {
 
 	@Override

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/data/alt/solr/CitySolrRepository.java

@@ -19,6 +19,7 @@ package org.springframework.boot.autoconfigure.data.alt.solr;
 import org.springframework.boot.autoconfigure.data.solr.city.City;
 import org.springframework.data.repository.Repository;
 
+@Deprecated
 public interface CitySolrRepository extends Repository<City, String> {
 
 }

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/data/jpa/JpaRepositoriesAutoConfigurationTests.java

@@ -23,9 +23,9 @@ import org.junit.jupiter.api.Test;
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.autoconfigure.TestAutoConfigurationPackage;
 import org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration;
+import org.springframework.boot.autoconfigure.data.alt.elasticsearch.CityElasticsearchDbRepository;
 import org.springframework.boot.autoconfigure.data.alt.jpa.CityJpaRepository;
 import org.springframework.boot.autoconfigure.data.alt.mongo.CityMongoDbRepository;
-import org.springframework.boot.autoconfigure.data.alt.solr.CitySolrRepository;
 import org.springframework.boot.autoconfigure.data.jpa.city.City;
 import org.springframework.boot.autoconfigure.data.jpa.city.CityRepository;
 import org.springframework.boot.autoconfigure.jdbc.EmbeddedDataSourceConfiguration;
@@ -162,7 +162,7 @@ class JpaRepositoriesAutoConfigurationTests {
 	@EnableJpaRepositories(
 			basePackageClasses = org.springframework.boot.autoconfigure.data.alt.jpa.CityJpaRepository.class,
 			excludeFilters = { @Filter(type = FilterType.ASSIGNABLE_TYPE, value = CityMongoDbRepository.class),
-					@Filter(type = FilterType.ASSIGNABLE_TYPE, value = CitySolrRepository.class) })
+					@Filter(type = FilterType.ASSIGNABLE_TYPE, value = CityElasticsearchDbRepository.class) })
 	@TestAutoConfigurationPackage(City.class)
 	static class CustomConfiguration {
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/data/solr/SolrRepositoriesAutoConfigurationTests.java

@@ -42,6 +42,7 @@ import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
  * @author Christoph Strobl
  * @author Oliver Gierke
  */
+@Deprecated
 class SolrRepositoriesAutoConfigurationTests {
 
 	private AnnotationConfigApplicationContext context;

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/data/solr/city/City.java

@@ -24,6 +24,7 @@ import org.springframework.data.solr.core.mapping.SolrDocument;
  * @author Christoph Strobl
  */
 @SolrDocument(collection = "collection1")
+@Deprecated
 public class City {
 
 	@Id

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/data/solr/city/CityRepository.java

@@ -20,6 +20,7 @@ import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.repository.Repository;
 
+@Deprecated
 public interface CityRepository extends Repository<City, String> {
 
 	Page<City> findByNameStartingWith(String name, Pageable page);

spring-boot-project/spring-boot-docs/src/docs/asciidoc/spring-boot-features.adoc

@@ -4494,6 +4494,7 @@ https://lucene.apache.org/solr/[Apache Solr] is a search engine.
 Spring Boot offers basic auto-configuration for the Solr 5 client library and the abstractions on top of it provided by https://github.com/spring-projects/spring-data-solr[Spring Data Solr].
 There is a `spring-boot-starter-data-solr` "`Starter`" for collecting the dependencies in a convenient way.
 
+NOTE: As of Spring Boot 2.3, support for Spring Data Solr has been deprecated and will be removed in a future release.
 
 
 [[boot-features-connecting-to-solr]]

spring-boot-project/spring-boot-starters/spring-boot-starter-data-solr/build.gradle

@@ -2,7 +2,7 @@ plugins {
 	id "org.springframework.boot.starter"
 }
 
-description = "Starter for using the Apache Solr search platform with Spring Data Solr"
+description = "Starter for using the Apache Solr search platform with Spring Data Solr. Deprecated since 2.3.9"
 
 dependencies {
 	api(project(":spring-boot-project:spring-boot-starters:spring-boot-starter"))